You won’t find James Ironmoccasin’s house on Google Maps. To get to his place on the northeastern edge of the Navajo Nation, head east from the 7-2-11 gas station on Highway 64 in Shiprock, take the sixth turn into “Indian Village,” a neighborhood of small, unnumbered houses on a winding, ungraded and nameless dirt lane, and follow for about a quarter mile, then turn at the dilapidated corral of horses.

Attorney General Hector Balderas says a controversial new question about citizenship on the U.S. Census questionnaire is illegal. Balderas joined a coalition of state attorneys general who filed a lawsuit to stop it.

The attorneys general, led by New York AG Eric Schneiderman, along with the U.S. Conference of Mayors sued in federal court today, saying the question would result in an illegal undercount of the population.

In December, the Department of Justice requested that the Census Bureau add a question to the 2020 survey that would ask respondents to reveal whether or not they are U.S. citizens. Since ProPublica first reported the DOJ’s letter, civil rights groups and congressional Democrats have announced their opposition, arguing that in the midst of President Donald Trump’s immigration crackdown, the question will lead many people to opt out of the census, resulting in an inaccurate population count.

Amid fears that a lack of money will prevent an accurate count, states are gearing up to identify the people the 2020 U.S. Census is most likely to miss, from trailer-park residents in New York to people living in shantytowns in New Mexico.

Residents of isolated rural areas, immigrants, and people who just don’t trust the government are among those who tend to be undercounted in the decennial census.